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I have an ulu that I use in the kitchen. Very handy, and could be made the same way. It's hard to find good ulus in the lower 48.
Note that an impulse goes right through these dropper capacitors, because the frequency is much higher than the 60 Hz they are designed for. There's nothing to resist the line spike but a small series resistor, and the high ESR, high inductance electrolytic. These lamps seem to have a high failure rate. I've also had a bad experience with chips that had bad wire bonds, and fail over temperature cycling or time (a year or two). Sometime the LED market will settle out and high reliability circuits and LEDs will prevail, but until then I'm only going to use reputable chips and electronic ballasts.
I need to find out how to make whole wheat bread rise. I don't want white bread.
Best I could come up with on April 1.
Buy a used TARDIS.
The LEDs run on 12 volts. To get a smooth dimming function, a PWM just chops the voltage going to the LEDs. They get variable width pulses of 12V instead of a varying DC voltage. The LEDs are non-linear and cut off around 7 volts, but the PWM is smooth down to a dim glow.
You can get just about anything on eBay. Search for a 12 volt PWM dimmer. I've used these in my kitchen, surface mount: www.ebay.com/itm/DC-12V-8A-Light-Dimmer-Brightness...Same for the LED strips; get a 5 meter reel. The power supply seems to be overkill....
I'd leave the plywood backing off it, and let air circulate off the backside of the aluminum plate.
I use a corning ware pot with a glass lid. Works OK, and the bread doesn't stick.
I sometimes use hot glue to bulk up the connector and protect the wires. You can put heat shrink over it.
I have never (in 50+ years) seen the sleeve of a jack used for anything but ground. In your schematic you identify this as the mic connector. Are you sure this is correct?
You can use one central power supply to run all your lights, and then use low voltage wiring to each fixture. It is a lot simpler and safer than running 120VAC to everything. You can use a backup battery, intelligent controls, motion sensor modules, 12V dimmers, and low voltage switches. The power supply can go in the basement where it's easily accessible. I'd put a motion sensor on those stair lights, with a parallel always on night light setting of barely glowing (or a different color).
Go to this table and play with wire sizes vs. current. http://www.rapidtables.com/calc/wire/voltage-drop-calculator.htmYou may find that the drop through the light strip is much more than the feed cable drop. You shouldn't run a 5 meter spool from one end because the far end is going to be dimmer. Note that to follow 120V code you'd have to use #14 or #12 wire anyhow, just to run ten milliamps to a light. So for light loads it makes sense to run #18 or 22 to a night light. I have a couple in dark corners that stay on. It took less current to run them continuously than running a motion sensor.
I have a lot of magnets from old hard drives. This would be great...
Sounds like an autoharp, a stringed instrument that clayed chords by letting some strings be plucked by hand, like a dulcimer, guitar, and synthesizer together. All you need is a phone, and some coding....I'm not volunteering...
I haven't seen anybody else answer this, but grid tie inverters need a 60 Hz reference from the power line to be able to run. If the power is off, they don't run. This is so they don't try to feed power back into the line. Safety feature, plus you probably can't feed the whole neighborhood without smoking your inverter. If you go off-grid, you just need a 60 Hz reference oscillator and you're good to go. A UPS does the same job. But you can't hook it up to the mains because the frequency and phase will be off.
I was confused that Unistrut wouldn't meet the "grounding" requirement, being steel and all; but I suspect it's more complicated than that. I see a copy of the UL code would cost $502 in PDF format, so I wasn't interested enough to find out. In Germany all this red tape has been standardized, and it costs much less to put in systems there.
Nickel-Iron is getting a new look, and you may see new products with updated materials soon. Utility scale storage will make solar viable, and if you care about longevity, cost, and toxicity, but not size or weight, Lithium doesn't look so good but nickel does.
I'd put a switch on it. I'd also run the low voltage wire down to the cellar where I have a 12V power supply that runs a bunch of other lights and gadgets. Having a wall wart running a wire into the wall doesn't look cool.
That looks like it has interleaved laminations so you'd have to take it apart leaf by leaf. If it's varnished together that would be a lot of work. Find a transformer which has the E laminations that separate easily from the I laminations, and the bobbin with the windings just slips right off. Solder wires to the terminals of the finer windings and you're done. Or, buy a small reel of magnet wire.
I have some chips that would be ideal for this. IPS6401. Temp and current protected MOSFET and driver, automotive grade. I sense an Instructable coming on.
Here's a circuit that works: Taillight Converter
Now you need a woofer. A sewer tile or glazed tile enclosure (sauerkraut crock?) would do it. You could use an offset hole and not mess around with the equalizer. To me the video just sounds like your room, or maybe it's the recording. Better to use a tone sweep and measure the SPL, so you can find the peaks. Caution people that using a different speaker or enclosure size invalidates the design and they have to do the calculations themselves.
Not too many people listen to bare drivers. The enclosure is part of the speaker system like a violin body is to the strings. You're going to need a woofer to go with these midranges, too. The last few seconds of his video, my sub just came alive .... oh, that wasn't his speakers, that was direct.
Open the back on that wooden mounting and you might get some bass out of it. Then use a bigger speaker. Then use a car tyre.
It's a lot easier to scrounge an old transformer and take it apart to get the windings. You can solder the two wires to an audio jack. It's mono, so use the two connections together, with the other wire soldered to the ground. Plug it into an audio amp.
This is pretty clever. But...I find it's just as quick to plug into the headphone jack to get full fidelity stereo, and you may have enough power to run passive speakers. If you have an amp, you'd get any amount of power you want.
I've zapped many a NiCd this way and got most of them to work. For a while.
If you cover blank areas with tape or big fat marker, you will use less ferric chloride. Connect them all and you'll have a nice ground plane for better shielding.
Small receiving tubes use barium getters, which result in that silvery stuff in the top of the tube that turns white when it goes to air. Not toxic, but don't eat it. Mercury tubes are industrial types, pretty rare. I had some ignitrons that contained pounds of mercury. Fluorescent lamp tubes contain small amounts.
I put strips into a U shaped channel used for mounting shelves. The shape shields your eyes from direct LED light. The other mod I did was to use a PWM dimmer box. They're $3 or so from China. I put an illuminated switch on the box so I can see the switch in the dark. I use a 12V power supply in the basement to power this and a few other gadgets and lights around the house. The only problem I've had is some of the segments have crapped out after almost 2 years of use. You get what you pay for. I over-lit it to begin with, but the gaps look silly. At least they're hard to see because of the shielding of the mounting strip.
You need patience to use solar power. Plus, you don't want to put too much current into a battery.
There are commercially available peltier cooler dehumidifiers. You could dry your cellar and get distilled water. However, the efficiency ratings tend to be vague. They should last a long time if made well, and the parts should be easily repaired (power supply, fan, cooler module) compared to a refrigerant based machine. Then again, I have a 30 year old dehumidifier that still runs like new.
Or, if you have a welder, zap it and there's no way it will loosen up.
I wrap colored tape around sockets and wrench handles. It cuts down the sorting by 50%.
I guess Mad Man Muntz was before your time, but he manufactured cheap TVs in the tube era. He'd go around to the design benches and snip out a component. If the TV still worked, it was off the parts list after that. So if it works for you without the damper circuit, with no radio interference, no problem. But the parasitic oscillation might intermodulate with the signal somehow; I've seen reports of high noise levels. Try it with and without the cap. You might look for a more modern chip. The NJM2113, for instance, has a push-pull output so no output capacitor is needed. Most chips today are class D, so they are more efficient. But so many are surface mount only.
I pulled out my 1980 National Semiconductor Audio/Radio Handbook for the answer to this. The LM386 has a tendency to oscillate in the RF range (5-10 MHz) on the negative swing when run into a heavy load. It's not a continuous heavy oscillation, but a little bit of fuzz on the bottom end. The solutions are to damp out the oscillation with the RC circuit, or to run a few turns of the output lead through a ferrite bead. If you run it at a lower voltage, or a lighter load, it may not oscillate. If it doesn't bother you or neighboring radio receivers, no problem.
Crawling in my beer can means war!
Yellow jackets are carnivorous, and feed on the bugs that are eating my garden. So I leave them alone now, as long as they don't build nests near the house.
I've found that they need another 10 dB of gain to run off a guitar. I use an effects box as a preamp. I also built a preamp in a box using a TL091 FET amp chip and a 9V battery.
My son's forester HAD the same issue, fixed it 2 months ago, similar method!
Do you need to control the speed, or just turn it on and off? You'll need a higher power transistor, and a FET would be easier to drive.
I suggest two substitutions:1. Use Gorilla glue, which sets fast, works with wet wood (requires it, actually), fills gaps, paints well, strong. 2. Instead of PBR, drink water because it tastes the same; or a dark Flemish abbey ale. I save the PBR for in-laws and baiting slug traps. (Just came back from Belgium so I'm spoiled.)
The regulator chip inside takes the 12V (more like 13.8 when the car's running) and regulates it down to 5V. If you feed it less than 12V it just dissipates less power, so that's good.
The regulator chip inside takes the 12V (more like 13.8) and regulates it down to 5V. If you feed it less than 112V it just dissipates less power, so that's good.
Answer: bad idea. If you have that much RF energy running through the house, you either live next to a radio station or need to be evaluated for dangerous levels of power. Unless you generate the power, it probably wouldn't be reliable. And if you do, it would be less effective than running wires. It would look cool, though.
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